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Potential of the point in the origin

  1. Jun 17, 2015 #1
    1. The problem statement, all variables and given/known data
    Find the potential of the point in the origin in regard to referring point at infinity if there's charged line laying on x axis as shown in the picture.

    Screenshot_1.png

    2. Relevant equations


    3. The attempt at a solution

    I know two ways to find a potential:

    V=∫dV and V=∫E*dl

    using first formula i have dv=dQ/4πε0r and i have Q=Q'dl but i don't know how to integrate that, i mean i have dl and i dont know what to do next.
     
  2. jcsd
  3. Jun 17, 2015 #2

    mfb

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    Integrate along the line from -a to a?

    I don't think the potential is well-defined, however.
     
  4. Jun 17, 2015 #3
    When i integrate from -a to a i get V=∫dQ/4πε0r=Q'/4πε0∫dl since ∫dl=2a i get V=Q'2a/4πε0r but this seems way to easy, so im not sure is it correct.
    I don't know what you mean, i have to find the potential at point B(0,0) and referring point is at infinity. That is how it's defined.
     
  5. Jun 17, 2015 #4

    mfb

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    Setting up the integral is easy.
    Yes, but you cannot do this if the integral diverges.
     
  6. Jun 17, 2015 #5

    rude man

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    what is r?
    I don't know what you mean, i have to find the potential at point B(0,0) and referring point is at infinity. That is how it's defined.[/QUOTE]
    what mfb means is the potential at the origin is infinity. You have been given an impossible assignment!
     
    Last edited: Jun 17, 2015
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